Stop data inserting into a database twice

Question

I was wondering what methods/preventions other programmers use to stop data being entered twice into a MySQL database when a user refreshes on the same page as a form? Obvio

Answer 1

Try including something in your forms to prevent double-submission, preferably at the same time protecting against cross-site request forgery. I recommend using what I call a formkey, which is a one-use field that uniquely identifies a form submission, tying it to an individual user at an individual address. The concept goes under other names too, but the short note I've linked to explains it well enough.